|
||
|
|
18th September 2018, 21:11 | #1 |
Gets stuck in
MG ZT190, MG ZS TD, MGF VVC, R200 TD bubble, Austin A35 Join Date: May 2017
Location: shrewsbury
Posts: 648
Thanks: 530
Thanked 82 Times in 56 Posts
|
Think I have a leak in the Vee :(
Pretty sure I'm leaking OAT into the V of the engine. I came back from a 2 week holiday and the battery on the ZS diseasel was flat so I took the ZT 190 to work instead. I got back home and could smell that yucky boiled off water/coolant smell. Had a look in the V and it looked a little damp with a wet area on the ridge of the plastic pipe . Is that the thermostat housing?
What are my options? Should I get a new thermostat along with a metal housing ? And what brand should I go for? Or should I first check that I don't simply need a new seal or something? I'm guessing the inlet manifold needs to come off again?
__________________
They say you should never meet your Idols. Well.... you know that car you always wanted? https://www.youtube.com/channel/UCGx...zZeAsYRU9aZu-A ^Be kind, Subscribe^ (MGR videos ) |
18th September 2018, 21:33 | #2 | |
MG ZT Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
|
Quote:
It is generally caused by a chemical incompatibility between the coolant and the o ring, which causes compression set to occur in the O ring, but can also be caused by poor installation technique My advice if you like the car, treat yourself to a nice shiny aluminium thermostat housing from Kaiser, fit this and never worry about it happening ever again Brian |
|
19th September 2018, 07:11 | #3 | |
Gets stuck in
Rover 75 2.5 V6 in Wedgwood Blue Join Date: Dec 2015
Location: Felbridge, East Grinstead
Posts: 982
Thanks: 250
Thanked 294 Times in 206 Posts
|
Quote:
I'm vastly better informed than I ever was before on the subject of chemical interaction between OAT and various sorts of plastic, not to mention compression of O rings and the possible purpose of the ratchet clips on the straight pipe, but at the end of the day a leak's a leak so whip it out and stick a new one in. One drawback of the Kaiser unit is that it no longer gives you the excuse to get in there and see what else has gone wrong!
__________________
Conformity is not morality. Consensus is not truth. |
|
19th September 2018, 10:11 | #4 | |||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,412
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Hello Gareth,
Some V6 owners, but my no means all, suffer coolant leaks in the ‘V’. The favoured solution is to renew all three plastic components. It appears that the thermostat housing’s welded seam has failed but on my car I proved that it hadn’t. The problem is flattening of the ‘O’ ring seals. You will have read one view on this: Quote:
To answer your specific questions Gareth: Quote:
My view is that the Chinese modified thermostat housing with the supporting legs is the most sensible choice. But you don’t have to renew the thermostat housing because it will be the ‘O’ ring which is causing the leak. Quote:
Correct Gareth! That is the right approach if (1) you’re doing the job yourself (2) you want to learn and (3) you don’t want to waste your money. Removing the inlet manifold chamber affords the best access, reduces the risk of damaging the plastic components during removal to virtually zero and enables you easily to get a torque wrench to the securing bolt. Personally I would never attempt the ‘keyhole’ method. Speed of completion is not important to me; high quality is. Finally Gareth, take no notice of any discourteous remarks which may follow from the author of post no. 2. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|||
19th September 2018, 16:12 | #5 |
MG ZT Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
|
The positioning of the Herbie clips on the straight section of pipe has nothing whatsoever to do with the failure mode known as compression set.
SD1too bases his findings on that of one car, and to be honest that's fine if it "works" for him, but believe me he is talking absolute nonsense and that is a fact backed up by basic engineering principle. Simon please learn why O rings attain compression set, then come back by all means and explain why you thinks this is caused by movement, instead of polluting threads with what can be described as very poor advice My advice to the OP is to fit a Kaiser stat and be done with it, the Chinese thermostat housings are at best spurious, and at worst not fit for purpose. Brian |
19th September 2018, 17:37 | #6 |
This is my second home
Rover 75 Tourer/ MG ZT-T 400 Join Date: May 2012
Location: Lhanbryde
Posts: 3,278
Thanks: 2,627
Thanked 1,523 Times in 869 Posts
|
God here we go yet again. Brian offers advice and very good advice in my humble opinion as it’s been talked about for a long time about OAT attacking silicon and rubber. Another member has a pop straight away, for pity’s sake flipping grow up, you can surely beg to differ without all this rubbish on someone’s post who’s just looking for advice not flipping point scoring yet again
|
20th September 2018, 11:10 | #7 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,412
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
If it's "compression set", all KV6's using OAT would suffer from it, but they don't. So there is some other factor at work isn't there.
Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
18th September 2018, 21:38 | #8 |
Premium Trader
Rover 75 Join Date: Nov 2010
Location: Devon
Posts: 33,788
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
|
Nope, keyhole method saves all the hassle.
__________________
Lest we forget..
|
|
|